File:Poligraf Poligrafovich.JPG|thumb|Heavy winter coat with countershading in a mixed-breed
File:Terrier mixed-breed dog.jpg|thumb|Mixed-breed terrier
File:My dog name is blue.jpg|thumb|Dog of mixed breed
File:DogsMixedBreedlittermates.jpg|thumb|right|These Litter (animal)|littermates share an Australian Shepherd mother, although neither exactly resembles that breed.
A '''mongrel''', '''mixed-breed dog''' or '''mutt''' is a dog
that does not belong to one recognized dog breed|breed
and is not the result of intentional dog breeding|breeding
Estimates place their numbers at 150 million animals worldwide.
Although the term "mixed-breed dog" is preferred by some, many mongrels have no known purebred ancestors. Furthermore, crossbreed dog
s, while literally a mix of dog breed|breed
s, differ from mongrels in being intentionally bred. Although...